DE2423292A1 - PLANT FOR POLISHING CUTLERY PARTS - Google Patents

Description

DIP

WORK EXEMFLAR

4 = s-tNer-H; STEKM ANN

85 NÜRNBE5K5 2

DIPL.-PHYS. DR. K. SCHWEINZER

DIPL.-ING. DR. M. RAU ΪΚΪίίΚίϊΚί .. * standing patent

PATENT LAWYERS TELEX 04-231 »

BANK ACCOUNTS:

DEUTSCHE BANK AG. NOINIEItG

0 / * 5 "5 0 Q 0 BLZ 74070012 ACCOUNT NO.341144

£. ty 4r W * - >? * ~ POST CHECK ACCOUNT: NORNBERO 47u «1-« S?

Nuremberg, May 13, 1974 18/48

E. Siepmann & Co., 5650 Solingen, Eintrachtstrasse "

'Plant for polishing cutlery items "

The invention relates to a system for polishing pieces of cutlery or the like, with two on each one closed Ring movable conveyor devices for the transport of workpiece holders for the cutlery items from a clamping device via at least one polishing machine and a clamping device back to the clamping device in the first ring or for transporting workpiece holders from the clamping device via at least one polishing machine and a jig back to the jig in the second ring.

Such a system is known from DT-OS 2 o46 921, in which conveyor tracks are provided as conveying devices, on which balancers can be moved, on each of which the individual workpiece holders are conveyed from the clamping table via the first set of polishing machines and to the clamping table will. The workpiece holder is inserted into the polishing machine by hand at each individual workstation or provided with unpolished cutlery on the jig. Need in this known system although the operators the workpiece holder with the

The fee schedule of the German Chamber of Patent Attorneys applies to the contractual relationship. - Place of jurisdiction for performance and payment: Nuremberg.

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Cutlery items are no longer passed on from machine to machine, but they still have to be carried out individually by hand Introduce them into the machines or place them on the clamping device or the clamping or unclamping device. It has also been shown that the conveyor tracks with the balancers impede the accessibility of the individual machines.

From the magazine "Galvanotechnik" 1968, issue 9, page is an automatic system for polishing cutlery items known, in which the polishing machines are arranged along a continuous, rectilinear conveyor path which ■ enables the use of only two workpiece holders, since they have to be returned on the same track, provided that they cannot be repositioned by hand. the both workpiece holders move on the one hand between the clamping device and the changeover device and on the other hand between the tensioning device and the unclamping device. The workpiece holders are straight in the as described moved on plates along the main transport path. These plates with the workpiece holders are each at right angles to the main transport line and horizontally fed to the individual polishing machines by means of pneumatic drive cylinders. Except for the minor one The efficiency of this system is the individual polishing machines practically from the beginning, i. H. from the side from which the workpiece holders are fed, inaccessible, so that daily replacement is necessary the polishing rollers and the frequent changes to different types of cutlery, especially in smaller businesses are difficult to implement.

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From the magazine "Metalloberfläche" 1967, issue 2, Pages 45 to 48 are more metallic for grinding and polishing Workpieces so-called rotary table machines known, in which on a clockwise basis by the same angular steps Drivable table arranged the workpieces. and by corresponding clockwise rotation of the Tables can be fed to the individual grinding stations. Here too, the individual grinding devices are from front, d. H. from the side of the turntable, .not or difficult to access.

The invention is based on the object of designing a system of the type described at the outset so that at Complete automation of the polishing processes means that the individual polishing machines are always easily accessible from the front.

According to the invention, this object is achieved in that the conveying devices are stationary, around a vertical one Rotary axis gradually drivable turrets are formed on which swivel arms at equal angular intervals are attached, each consisting of a hinged with one end on the rotating part of the tower about a horizontal axis, upwardly projecting inner arm part, which can be driven radially outwardly pivotable about the axis, and out one articulated at its other end, extending radially outward, in each case in the area of its free End an outer arm part carrying a workpiece holder, and that the polishing machines assigned to each rotating tower and devices on a circle around the axis of rotation of the associated turret in one of the Swivel arms are arranged bridged distance.

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A major advantage of the measures according to the invention is that the workpiece holder carrying Swivel arms are swung up in their retracted position and thus the space between each turret and the assigned polishing machines or devices completely free, so that a replacement of the polishing rollers and a changeover of the polishing machines is possible in the simplest way without hindrances. Furthermore, this will help achieves that a total of only as many workpiece holders have to be used as there are workstations at all are available, as all workpiece holders are always in use. This also results in a considerable amount Increase in the working speed, since there is no polishing machine or device, from the extremely short ones Transport times aside, works idle. The greatest possible height and width of the space between Rotary tower and polishing machine is achieved if, according to an advantageous feature of the invention, the pivot arms between a position with an approximately vertical position of the inner arrate part and approximately horizontal position of the outer one

with

Arm part and a position / radially relatively extended position of the arm parts are pivotable. The pivoting movement the swivel arms is expediently carried out in such a way that each swivel arm of a hydraulic or pneumatic cylinder can be driven, each of which is simultaneously in the from a common pressure source one or the other direction can be driven, or in such a way that all swivel arms of a turret from one common hydraulic or pneumatic working cylinder can be driven. In the latter case it is expedient the transmission of the sliding movement of the

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2423232

Working cylinder on the individual swivel arms by means of a suitable linkage.

To ensure proper insertion of the workpiece holder with the cutlery into the individual polishing machines • granted! Most and as far as possible an extension of the To enable swivel arms and at the same time to guide the workpiece holder on the polishing machine by means of a to enable known guide device without the Free passage space between the rotating tower and the polishing machine is disturbed when the swivel arm is swiveled up, it is of great advantage when a minimum angle between the outer arm part and the inner arm part by a Stop is set, which is expediently 80 to 9o ° amounts to.

Furthermore, it is of great advantage if each workpiece holder can be displaced parallel to the horizontal axis outer arm part is attached. This is with fully automated Polishing an oscillating motion of the. Workpiece holder and thus the cutlery allows. It is also of great advantage if each workpiece holder is pivotably attached to the outer arm part is, because this results in a guide of the cutlery clamped in the workpiece holder according to their Shape on the polishing rollers is possible. Furthermore it is It is advantageous if each workpiece holder has at least one guide roller, which is a curve piece on each polishing machine assigned. This ensures that the pivotable workpiece holder in a position in the polishing roller pairs introduced and out of these

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can be pulled, in which damage to the cutlery is excluded. It is useful to if on the workpiece holder a counteracting pivoting by the cam piece and guide roller acts Resetting device attacks, which just at the beginning of the insertion process or when pulling out the guide roller presses firmly on the curve piece and, moreover, always after the guide roller has run off from the curve piece the same precisely defined position of the workpiece holder is guaranteed.

Further advantages and features of the invention emerge from the description of an exemplary embodiment the drawing. Show in the drawing

Fig. 1 is a top view of a system according to the invention in a schematic representation,

Fig. 2 is a vertical valley section through a rotating tower a system according to Fig. 1 according to the section line H-II in Fig. 1 in a more detailed representation,

Fig. 3 is a plan view of a swivel arm with workpiece holder on an enlarged scale and

4 shows a side view of a workpiece holder a polishing machine with a guide device.

In the case of the system shown in FIG. 1 for polishing Two turrets 1 and 2 are provided for items of cutlery.

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A clamping device 4, four polishing machines 5 * -6, ¹ J ₃ 8 for pre-polishing and final polishing, for example the Spoon of a spoon; and a tensioning device 9 is also provided, if on a circle around the vertical axis of rotation Io of the second turret 2, the tensioning device 9 * two polishing machines 11, 12 are again at the same angular intervals, in this case at an angular distance of 90 ° in each case - and finish polishing, for example the handle of a spoon or fork, 'and a clamping device 13 is arranged. The vertical plane spanned by the axes of rotation J> and Io of the turrets 1 and 2 thus coincides with the central transverse plane of the transformer 9

On the two turrets 1 and 2, one of the number of associated polishing machines and devices is linked to the number of swivel arms I ² I- arranged at the same angular distance as this number have similar items of cutlery. The structure and function of the clamping, unclamping and unclamping devices and the polishing machines and their arrangement one behind the other in the work flow is known and generally customary, so that further explanations are unnecessary in this respect.

Each turret 1 or 2 has a stationary base 16 on which a rotary part 17 which can be rotated about the axis of rotation J> or Io is mounted. This rotating part 17 consists of

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a lower, horizontally lying table 18 and a column 19 extending upwards beyond it. The swivel arms 14 - consist of an inner arm part 25 articulated on the turntable by means of the joints 22 and an ^{outer arm part 25 articulated at the other end by means of joints 2 2} I - each arm part consists of two lever pieces 23 'and 25' lying parallel to one another, the two lever pieces 25, 25 'of the inner arm part are stiffened by a cross member 2o, while the lever pieces 25' of the outer arm part 25 are stiffened like a frame by cross members 2o 'and 2o "attached in the region of their ends.

The inner arm part 23 hinged to the table 18 is in each case by means of a pneumatic working cylinder 26 engaging approximately in its center on the cross member 2o between an approximately vertical position and a position inclined by approximately 60 ° with respect to the vertical can be pivoted. To the Lever pieces 23 'of the inner arm portion 23 is in the area of the joints 24 each have a bracket 27 projecting approximately perpendicular to the respective lever piece 23 'attached the free end of which, in turn, has an adjustable stop pin 28 attached to it, to which a stop surface 29 is assigned to the respective corresponding lever piece 25 'of the outer arm part 25. This is the between the inner arm part 23 and the outer arm part 25 included minimum angles of about 85 to 90 ° (see FIG. 2) set, while the outer arm part 25 compared to the inner arm part 23 in the opposite sense - in Fig. 2

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clockwise - can be pivoted freely. This _: embodiment has the consequence that when the inner arm part 23 is pivoted up by moving the pneumatic working cylinder 26 together, the outer arm part is pivoted up into an approximately horizontal position while. ..he can move freely with respect to the inner part of the device in the event of a shift to the polishing machine or device to be described below.

At the _ £ uertraversen 2o "located at the free end of the swivel arms 14 are _parallel to the lever pieces 25 ' protruding retaining arm 3o with guide bushings 31 attached, in those parallel to each other and in the plane of the outer arm part 25 and perpendicular to the lever pieces 25 'two guide rods 32 displaceable in the longitudinal direction are stored. At each end, a holding plate 33 is attached to both guide rods 32, that is to say transversely to the outer arm part 25 is displaceable, but not pivotable with respect to this. In the two retaining plates 33 is by means of a pivot pin 34 per se known workpiece holder 15 for receiving cutlery. share 35 locked. The workpiece holder has two clamping jaws 36, 37, between which these pieces of cutlery 35 be held elastically clamped. The trunnions 3 ^ extend through the holding plates 33 and become received in a guide device 38 attached to each polishing machine, the two possibly angled Has guide arms 39 with an upper guide surface 4o, at the end thereof facing the polishing rollers 4l, 42 in each case a slot 43 is attached, in each of the the outer end of each pivot pin 34 is inserted.

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From the polishing machine. seen behind the through the aligned pivot pin 34. specified Pivot axis of the workpiece holder 15 ,. so between this .Swivel axis and the outer arrate part, 25 sincUan the Workpiece holder guide rollers 44 attached, which when inserting the workpiece holder 15 into the slot 43 of the " Roll the guide device 38 over corresponding curve pieces 45 connected to the guide device 38 and so the workpiece holder 15 and thus the clamped cutlery items 35 before the latter is inserted between the polishing rollers 4l, 42 in a very specific Bringing the position relative to the polishing rollers «A lifting of the Guide rollers 44 of the curved pieces 45 is before the insertion of the cutlery between the polishing rollers 4l, or after the cutlery has been pulled out of the polishing rollers by a counter-rotating torque Tension spring 46 prevents. A guide device itself is for manual insertion of the workpiece holder and a manual pivoting of the workpiece holder is known from German utility model 7 323 297. The guide rollers 44 with the curve piece 45 are used to attach to the workpiece holder to exert a moment counteracting the moment through the polishing rollers to avoid a collision of the cutlery items to prevent with the polishing rollers when inserting or withdrawing.

The rotary part 17 of each turret 1 or 2 is opposite the base l6 by means of a drive motor 47 and 'one interposed stepping gear 48, for example a Maltese cross, in angular steps

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- li -

drivable, the angular division of the respective arrangement _{; +} voltage - in Fig. 1 left so 60 ° and in Fig · I right. as 9o ° - corresponds to, ■

"The system works as follows:

A larger number of similar pieces of cutlery 35, for example forks ... or spoons, are clamped with their handle in the workpiece holder 15 / on the clamping device 4. The pivot arms Ik are here - all in the radially largely extended position shown in FIG. 1, in which all working cylinders 26 are fully extended , whereby the inner arm parts 23 linked to the table 18 come into their approximately vertical position - shown in Fig. 1 - and the respective outer arm part 25 is pivoted up by the stop pin into an approximately horizontal position »Then the rotating part 17 of the turret 1 rotates an angular step, in the present case therefore 60 °, so that the swivel arm with the as yet unpolished cutlery items 35 comes in front of the first polishing machine 5. Then the working cylinder 26 is extended again so that the inner arm part 23 hinged to the table 18 lowers, whereby at the same time the workpiece holder 15 attached to the outer arm part 25 is lowered and displaced radially outward. The outer ends of the pivot pin ~ $ k come here on the guide surface 4o of the guide arms 39 and are pushed into the guide slots Kj> up to the end. During this displacement on the guide surface 4o, the stop surface 29 of the outer lifts

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Arm parts 25 from the associated stop pins 28. During this insertion process they roll at the same time bring the guide rollers 44 over the curve pieces 45 and the workpiece holder 15 and thus the cutlery parts 35 clamped therein in a precisely defined position to the polishing rollers 41, 42, causing damage to the cutlery during insertion and again later is avoided when pulling out. During this polishing process in the first polishing machine 5 are on the Clamping table 4 already has new cutlery items 35 in the workpiece holder 15 of the next swivel arm 14 trapped.- **'"'

Following the polishing, the swivel arms 14 are swiveled up again and thus pulled in at the same time and then the rotating part 17 of the rotating tower 1 is advanced by an angular step. This process is repeated until all polishing machines have been run through. During the polishing process in the machines J _t 8, the guide arms 39 of the guide device 38 shown in FIG. On the other polishing machines there are also guide arms with guide surfaces 4o and slots 43 for receiving the pivot pins 34, but these guide arms either stand still or can only be moved horizontally according to the required movements of the cutlery item during the polishing process. So that such movements of the workpiece holder are possible during the polishing process, the pneumatic

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Working cylinder 26 in the extended position of the pivot arms 14 without pressure. After going through all the polishing machines the workpiece holder 15 described arrives again at the clamping device 9 · In this clamping device 9, the pieces of cutlery on their parts that were polished in the first workflow are taken from a Workpiece holder 15 of the turret 2 detected «The same workflow then takes place as on the Dr.eh. tower 1, wherein the cutlery 35 on their handles in front and be polished and then unclamped in the clamping device.

- Expectations -

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Claims (9)

Expectations 1.) System for polishing cutlery parts, with two conveyor devices, each movable on a closed ring, for transporting workpiece holders for the cutlery items from a clamping device via at least one polishing machine and a clamping device back to the clamping device in the first ring or for transporting workpiece holders from the clamping device via at least one polishing machine and an unclamping device back to the clamping device in the second ring, characterized in that the conveying devices are constructed as stationary rotating towers (1, 2) which can be driven step by step around a vertical axis of rotation and on which swivel arms (l4) are at equal angular intervals are attached, each of an end on the rotating part (17) of the tower articulated about a horizontal axis (21), upwardly projecting, about the axis radially outwardly pivotable drivable inner arm part (25) and from one at the other end hinged, extending radially outward extending outer arm part (25), each carrying a workpiece holder in the region of their free end, and that the polishing machines (5 to 8; 11, 12) and device (4, 9; 9 * 13) are arranged on a circle around the axis of rotation (j5; lo) of the associated turret at a distance that can be bridged by the pivot arms. 2.) Plant according to claim 1, characterized in that the pivot arms (14 ·) between a position with an approximately vertical position of the inner arm part (23) and approximately 509047/0238 horizontal position of the outer arm part (25) and a position with a radially relatively extended position the arm parts can be swiveled " 5.) System according to .Anspruch 1 or 2, characterized in that it advised ',' that each swivel arm (14-) can be driven by a hydraulic or pneumatic working cylinder (2β). - · 4-.) Plant according to claim 1 or 2, characterized in that all swivel arms (14) of a rotating tower (1 or 2) can be driven by a common hydraulic or pneumatic working cylinder. 5.) System according to one of claims 1 to 4 ·, characterized in that a minimum angle between the outer arm part (25) and the inner arm part (25) is determined by a stop "(27, 28, 29). 6.) Plant according to claim 5, characterized in that the minimum angle is 8o ° to 9o °. 7.) Plant according to one of claims 1 to 6, characterized in that each workpiece holder (15) is parallel (21) to the horizontal axis / movable on the outer arm part (25) is attached. 8.) Plant according to one of claims 1 to Y, characterized in that each workpiece holder (15) is pivotably mounted on the outer arm part (25) « 5098U / 0238 9.) Plant according to one of claims 1 to 8, characterized in that each workpiece holder (15) has at least .eine guide roller (44) which has a cam piece (45) on each polishing machine (5 * 6, 7, 8, 11, 12) is assigned. . ' Lo.) System according to claim 9, characterized in that a restoring device (46) acting against the pivoting by the cam piece (45) and guide roller (44) acts on the piglet holder (15). 509847/0238 Blank page